Published September 16, 1994 | Version v1
Patent Metadata-only

Fuel assembly

Creators

  • 1. AITEL Corp., Tokyo (Japan)

Description

A fuel assembly comprises a fuel movable portion in which a group of fuel pins are vertically movable by gravity or fluid pressure of coolants, a releasing mechanism which secures axial displacement and rotation of the fuel movable portion during normal operation and releases the securing state when a temperature of the secured portion exceeds a predetermined limit value if coolant temperature is abnormally elevated, and a re-securing mechanism for securing the fuel movable portion after movement. When the coolant temperature is abnormally elevated, the fuel movable portion moves axially moved to change the relative position between the fuel movable portion and a reactor core, which leads to reactor shut down by utilizing caused negative reactivity. That is, if the temperature of the coolants is abnormally elevated, the releasing mechanism releases the securing state, so that the fuel movable portion moves axially and is secured again at the distal end of movement. With such procedures, the relative position between the fuel movable portion and the reactor core is changed to provide negative reactivity which surely leads to reactor shut down. (N.H.)

Availability note (English)

Available from JAPIO. Also available from EPO.

Additional details

Publishing Information

Imprint Pagination
5 p.
IPC:
Int. Cl. G21C9/02; G21C3/30.
IPC
Int. Cl. G21C9/02; G21C3/30.
Patent number
JP patent document 6-258480/A/

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
26041657
Subject category
S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Non-conventional Literature
Descriptors DEI
COOLANTS; CRITICAL TEMPERATURE; FLUID FLOW; FUEL ASSEMBLIES; FUEL PINS; GRAVITATION; LMFBR TYPE REACTORS; OPTIMIZATION; REACTIVITY; REACTOR CORES; SCRAM
Descriptors DEC
BREEDER REACTORS; EPITHERMAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; FUEL ELEMENTS; LIQUID METAL COOLED REACTORS; PHYSICAL PROPERTIES; REACTOR COMPONENTS; REACTOR SHUTDOWN; REACTORS; SHUTDOWN; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE

Optional Information

Secondary number(s)
JP patent application 5-48183.